What’s The Line Pipe API 5L PSL1 PSL2?

The difference between psl1 line pipe and psl2 line pipe, PSL is the abbreviation for Product Specification Level (API SPEC 5L – American Petroleum Institute Standard). The special product level of the pipe is divided into PSL1 and PSL2, and it can also be said that the quality level is divided into PSL1 and PSL2. pipeline pipe includes seamless steel pipe and welded steel pipe of two types, whose pipe ends include flat ends, threaded ends and socket ends; for end welding, ring connection, socket connection and other connections, etc.

The difference is that PSL2 is higher than PSL1, these 2 specification levels are not only different in the inspection requirements, but also different in chemical composition and all products, so when cutting In accordance with API 5L, the conditions of the contract must indicate the product specification level, for example PSL1 or PSL2, in addition to the usual information such as specifications and steel grade; PSL2 is stricter than PSL2 in terms of chemical composition, tensile strength, impact performance, non-destructive testing and other measures are stricter than PSL1; PSL1 does not need to work, PSL2 plus x80 all steel grade, all size 0 ℃ Aqua average: longitudinal ≥ 41J, transverse ≥ 27J. X80 steel grade, full size 0 ℃ Aqua medium: longitudinal ≥ 101J, transverse ≥ 68J; the pipe must be made by branch hydraulic test, and the standard does not provide for the non-destruction of water pressure is allowed, this is also a big difference between the API standard and Chinese standard (GB/T9711); PSL1 does not require nondestructive testing, PSL2 should be nondestructive testing branch by branch; the main difference is that the pipe end of PSL2 must be sandblasted, while PSL1 does not have to, other places are basically the same; PSL-2 requirements are more stringent, from the selection of raw materials and testing methods, are more stringent. There are also requirements for the final production process

1) The production process of the pipe

Welded steel pipes are usually distinguished by the process of welding (ERW), spiral submerged arc welding (SSAW) and straight seam submerged arc welding (LSAW) three processes. These three processes produce welding pipe, due to its raw materials, production process, diameter and the quality of the difference, in the application areas have their own place.

(a) Longitudinal resistance welded pipe (ERW)

Resistance welded pipe is the earliest in China, the most widely used, production units (more than 2000), more production (about 80% of the total capacity of welded pipe ) of steel pipe variety, product specifications Ф20~610mm, in the country industry has played an important role in the construction of ERW219-610mm unit since the 1980s, there are about 30 groups of more than the introduction of foreign advanced technology. After years of production practice, the level of technology and progress, product quality is also improved. Because of its low capital, quick profit, many applications and rapid development. With the development of CSP plate production, which provides low cost, reliable quality raw materials, and for its further development in the future to create good conditions. Part of this product is made from the transport of liquid, the factory to the seamless pipe, the use of good oil pipe, pipe. Its production process should be: paper and strip raw material → raw material pre-processed